I had the same problem. It turned out to be the lower dash panel mounts (under the streering wheel). I took it apart and used a small amount of grease where there was contact to the main dash panel.......Fixed.
I had a similar clicking rattle under the dash. When I took the panels off below I found a cross member with two thin peices of metal. I put non-firction tape on them so that they would not touch together. The noise went away.
This noise is on a 2006. The 2004 that I had was rattle free.
Can anyone tell me if the sensor I have circled in the picture is the temp sending unit for temp idiot light on a 68 GTO. The light does not come on when I turn the ignition key like the “gen” and “oil” lights do so I want to make sure it’s working. If that’s it, any advice on testing it?
2005 gto key physically won't turn , I ordered the new revised cylinder , but in order to remove the old cylinder you need to turn the key to on position ,then push the the little button with the Allen wrench ,what do I do ,my steering wheel is also locked